Hydraulic pump



Dec. 6, 1949 B F, SNYDER 2,490,484

HYDRAULI C PUMP 2 Sheets-Sheet `l Filed Aug. 2l, 1948 Dec. 6, 1949 B. F. sNYDER `2,490,484

HYDRAULIC PUMP Filed Aug. 21, 1948 2 Sheets-Sheet 2 4 Eug-5 j ATTORNEY In order to expel water from the cylinder there has been provided a piston I3 which is mounted at the lower end of a tubular piston rod or shaft I4. This piston rod has its lower end screwed into the collar I5 of the piston which carries a leather ring or cup I6 of such diameter that it iits tightly within the cylinder and causes the piston to exert expelling force when the piston is moved downwardly. The collar is open at its center and formed with threaded sockets I1 into which are screwed elongated bolts I8 which extend downwardly from the collar and carry a valve I9 consisting of a metal plate 20 upon which' rests a rubber disk 2|. Registering openings are formed through the rubber disk 2| and the metal plate 29 to receive the bolts I8 andthe thickness of the valve is such that when it is in the lowered position and resting upon the heads 22 of the bolts suicient space will be provided between the valve and the collar to allow water to flow downwardly from the stem or shaft I4 into the cylinder below the piston.

Downward movement is imparted to the piston and its rod by the weight of water in -a tank or container 23, and upon referring to Figure 4 it u Will be seen that the upper end of the piston rod is threaded and passes through an internally threaded collar 25 which is mounted against the bottom of the tank about an opening 26 formed therein. The stem or tubular shaft protrudes upwardly into the tank to such an extent that gravel which may be carried into the tank with water iiowing from the source of water will be prevented from passing downwardly through the valvestem and into the cylinder where it would be liable to damage the pump. A cross bar 21 is mounted in the upper portion of the tank diametrically thereof and through this bar is formed an opening 28 to receive the looped end 29 of a cable 39, a rod 3| being passed through the loop and engaging the under face of the cross bar so that the loop may not be pulled upwardly through the opening in the cross bar. The cable extends upwardly from the tank and then horizontally in engagement with wheels of the pulleys I2 with a portion extending downwardly in outwardly spaced relation to one side of the pit I. A disk 32 is mounted upon the outer end of the cable and upon this disk rests metal blocks 33 which are formed with slots 34 leading from their side edge faces and thus allow a suitable number of blocks to be set in place about the cable one upon another and form a weight 35 which will be sufficient to pull the tank or container 23 and the piston upwardly when the tank ,is substantially empty. Therefore the tank may be drawn upwardly as it is emptied of water and during this upward movement the valve I9 will be disposed in its lowered or opened position and water may continue to ow through the tubular piston stem and not interfere with upward movement of the piston. I

When the tank is in its raised position it is gradually lled with water owing from vthe source of water and this Water will ow downwardly through the piston rod and into the cylinder until the cylinder is lled, also the piston rod and the tank then gradually filled. The tank has an outlet opening 36 formed through its bottom adjacent the marginal edge thereof andin order to close this outlet opening during lling of the tank there has been provided a valve 31. This valve is formed-as shown in Figure 4 and has a rubber gasket 38 mounted about and against the under faceof a metal plate or disk 39 carrying a collar 40 which is in threaded engagement with the lower end of a stem or gulding arm 4I. The stem projects upwardly and through an opening 42 formed in a yoke 43 which is formed from a strip of metal and is secured at its ends to the bottom and the side wall of the tank and at its upper end carries a ring 44 which is held upon the stem by upsetting the upper end of the reduced upper portion of the stem and thus forming a rivet head. Since the lower end of the stem is screwed into the collar 40, the stem may be passed downwardly through the yoke and then screwed into the collar. The stem guides vertical movement of the valve, as also does a pin 46 which extends downwardly from the valve and through an opening formed in a guide yoke 41 mounted against the under face of the bottom of the tank and extending diametrically of the outlet opening 36. When the valve 31 is closed' the tank may be lled with water and its weight will overcome that of the weight 35 and the tank will be moved downwardly. During this movement the valve I9 closes and the piston forces water out through the service pipe. As the piston nears the bottom of the cylinder and the tank nears the lower end of its vertical path of movement the pin 41 has abutting engagement with the head at the uper end of the abutment rod 48 and this will cause the valve 36 to be shifted upwardly to an opened position and water will then escape from the tank. This lessens the weight of the tank until the weight 35 can raise the tank and during upward movement of the piston its valve I9 will be opened so that this upward movement will not be stopped by action of the closed valve. The abutment rod 48 is screwed into the upper end of an internally threaded sleeve or tube 49 which is mounted upright in the concrete wall of the pit and since a recess 59 is formed in the wall of the pit above the upper end of the tube the abutment rod 48 may be readily grasped and turned in order to vertically adjust the abutment rod and cause opening of the outlet valve 31 when the tank reaches a predetermined position during its downward movement. When the outlet valve is raised to an opened position a latch 5| which is pivotally mounted upon the bridge 43 moves into position for its upper end to engage under the collar or disk 44 and the valve will be held open so that escape of water through the opening 36 will not be interfered with by premature closing of the valve. As the tank reaches its raised position and is empty except for the small amount of Water held in the tank by the protruding upper end of the tubular piston rod or shaft I4 an arm or lever 52 which protrudes from the pivoted end of the latch will engage the lower end of an abutment rod 53 and the latch will be tilted to a position in which it releases the outlet valve and allows it to drop to a closed position. The tank may then be again lled with water until its weight is suiiicient to move it downwardly and impart another power stroke to the piston. The upper portion of the abutment rod 53 passes through the bar 8 and the shield 9 and carries nuts 54 and 55. From an inspection of Figure 3 it will be seen thatby grasping the wheel 56 at the upper end of the rod and shifting the rod longitudinally it may be disposed in position for releasing the latch when the tank has moved upwardly to a predetermined position and the nuts then tightened t0 hold the rod in the adjusted position. It will thus be seen that the outlet valve of the tank will be automatically opened and closed at predetermined times and thereby allow the tank to be lled with water for imparting a power stroke to the piston and the water then allowed to escape and the valve held open until the weight 35 has returned the tank to its raised position. Water may thus flow from a lake, stream, or other source of supply into a tank and ow from the tank into the cylinder 2 from which it is pumped to a place of use.

To prevent the tank 23 from vshifting out of line, which may cause the abutment rod 53 to leave the lever 52, I have provided tubular rod 51 secured at its lower end in the concrete wall of the pump I and extends vertically with its upper end secured to the cross channel 8. A sleeve -58 through which the rod reciprocates is secured to the tank 23.

Having thus described the invention, what is claimed is:

1. In a hydraulic pump, a pit open at its top, a cylinder disposed vertically in said pit and having a valve controlled cleanout pipe communicating with the pit and a discharge pipe, a support over said pit, a tank having an outlet through its bottom, a pulley carried by said support, a cable trained about said pulley and having one end connected with the tank and its other end carrying a weight for exerting pull upon the cable and drawing the tank to a raised position, a piston operating in said cylinder and provided with a downwardly opening check valve movable upwardly to a closed position as the piston moves downwardly, a tubular piston rod rising from the piston and having its upper end mounted through the bottom of the tank, an outlet valve in said tank shiftable vertically from a lowered position in closing relation to the outlet to a raised position and having a pin extending downwardly through the outlet, an abutment in position for engagement with the pin to shift the outlet valve upwardly to an opened position as the tank moves downwardly to impart a power stroke to the piston and approximately reaches vthe limit of its downward movement, a stem extending upwardly from the outlet valve, a latch movable into and out of position to engage the stern of the outlet valve and releasably secure the said outlet valve raised during upward movement; of the tank by action of said weight, and an abutment rod carried by said support and extending downwardly therefrom in position to engage the latch and move the latch to a releasing position allowing closing of the outlet valve and iilling of the tank with water as the tank approaches the upward limit of its movement.

2. In a hydraulic pump, a cylinder having a discharge pipe leading therefrom, a piston operating in said cylinder and having a tubular rod extending therefrom out of the cylinder, a tank connected with the piston rod and communicating with the cylinder through the said piston rod, a valve controlling ow of liquid through the piston rod and being moved to a closed position during a power stroke of the piston, means for shifting the tank upwardly to a raised position when empty, the tank being adapted to be filled with liquid when raised and thereby create weight for moving the tank downwardly and imparting a power stroke to the piston, said tank having an outlet opening through its bottom, a bridge over the outlet opening, a valve in the tank for closing the outlet movable vertically to opened and closed positions, a stem for the outlet valve extending upwardly therefrom and through the bridge, a collar about the upper end of the valve stem, a latch pivoted to the bridge and normally in position to engage under the collar and hold the outlet valve raised, an adjustable abutment for engaging the latch and moving the latch to a releasing position when the tank reaches a predetermined elevation as it moves upwardly, and an abutment for moving the outlet valve upwardly to its opened position during downward movement of the tank.

3. In a hydraulic pump, a cylinder having a discharge pipe leading therefrom, a piston operating in said cylinder and having a tubular rod extending therefrom out of the cylinder, a tank connected with the piston rod and communicating with the cylinder through the said piston rod, a valve controlling flow of liquid through the piston rod and being moved to a closed position during a power stroke of the piston, means for shifting the tank upwardly toa raised position when empty, the tank being adapted to be filled with liquid when raised and thereby create weight for moving the tank downwardly and imparting a power stroke to the piston, said tank having an outlet opening through its bottom, a bridge over the outlet opening, a valve in the tank for closing the outlet movable vertically to opened and closed positions, a stem for the outlet valve extending upwardly therefrom and through the bridge, a strip carried by the tank and extending under the outlet opening, a pin extending downwardly from the outlet valve and slidably passing through the said strip, a latch carried by said bridge for releasably holding the outlet valve in its opened position, a member for moving the latch to a releasing position as the tank approaches a raised position, and a member for engaging the pin and moving the outlet valve to its opened position as the tank moves downwardly.

4. In a hydraulic pump, a cylinder having a discharge pipe leading therefrom, a piston operating in said cylinder and having a tubular rod extending therefrom out of the cylinder, a tank connected with the piston rod and communicating with the cylinder through the said piston rod, a valve controlling flow of liquid through the piston rod and being moved to a closed position during a power stroke of the piston, means for-shifting the tank upwardly to a raised pos-i, tion when empty, the tank being adapted to be lled with liquid when raised and thereby create weight for moving the tank downwardly and imparting a power stroke to the piston, a normally closed outlet valve for said tank, a stem extending downwardly from the outlet valve, a member for engaging the stem and moving the outlet valve upwardly to its opened position during downward movement of the tank, a latch for releasably holding the outlet valve in its opened position, and a member for moving the latch to a releasing position as the tank approaches a raised position.

BALLARD F. SNYDER.

REFERENCES CITED The following references are of record in the iile of this patent:

UNITED STATES PATENTS Number Name Date 111,536 Herring Feb. 7, 1871 1,332,540 Burdick Mar. 2, 1920 FOREIGN PATENTS Number Country Date 39,379 Switzerland Jan. 23, 1907 

